Judit, I talked to someone recently that had purchased and used in an upholstery application the kind of foam that recovers afterwards... right now I cannot at all remember the name of it, but I think everyone should know what I'm talking about. Lots of mattresses right now are popular with this type of stuff in it. The foam supplier I use ~ Carl Havens ~ carries it in sheets of varying thicknesses.
Shirley, please share with all your ebay finds. I'm a convert myself. My standard shoe shopping habits are to try on what I like, determine size, and find on ebay. And the fabric finds? Wow, have I saved massive amounts of money for myself as well as clients.